[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // neutron_hp -- source file |
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| 27 | // J.P. Wellisch, Nov-1996 |
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| 28 | // A prototype of the low energy neutron transport model. |
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| 29 | // |
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| 30 | #include "G4NeutronHPInterpolator.hh" |
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| 31 | |
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| 32 | G4double G4NeutronHPInterpolator:: |
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| 33 | GetBinIntegral(const G4InterpolationScheme & aScheme, |
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| 34 | const G4double x1,const G4double x2,const G4double y1,const G4double y2) |
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| 35 | { // inline again later on @@@@ |
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| 36 | G4double result = 0; |
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| 37 | if(aScheme==HISTO||aScheme==CHISTO||aScheme==UHISTO) |
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| 38 | { |
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| 39 | result = y1*(x2-x1); |
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| 40 | } |
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| 41 | else if(aScheme==LINLIN||aScheme==CLINLIN||aScheme==ULINLIN) |
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| 42 | { |
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| 43 | result = 0.5*(y2+y1)*(x2-x1); |
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| 44 | } |
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| 45 | else if(aScheme==LINLOG||aScheme==CLINLOG||aScheme==ULINLOG) |
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| 46 | { |
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| 47 | if(x1==0) result = y1; |
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| 48 | else if(x2==0) result = y2; |
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| 49 | else |
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| 50 | { |
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| 51 | G4double b = (y2-y1)/(std::log(x2)-std::log(x1)); |
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| 52 | G4double a = y1 - b*std::log(x1); |
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| 53 | result = (a-b)*(x2-x1) + b*(x2*std::log(x2)-x1*std::log(x1)); |
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| 54 | } |
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| 55 | } |
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| 56 | else if(aScheme==LOGLIN||aScheme==CLOGLIN||aScheme==ULOGLIN) |
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| 57 | { |
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| 58 | if(y1==0||y2==0) result =0; |
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| 59 | else |
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| 60 | { |
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| 61 | G4double b = (std::log(y2)-std::log(y1))/(x2-x1); |
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| 62 | G4double a = std::log(y1) - b*x1; |
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| 63 | result = (std::exp(a)/b)*(std::exp(b*x2)-std::exp(b*x1)); |
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| 64 | } |
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| 65 | } |
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| 66 | else if(aScheme==LOGLOG||aScheme==CLOGLOG||aScheme==ULOGLOG) |
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| 67 | { |
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| 68 | if(x1==0) result = y1; |
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| 69 | else if(x2==0) result = y2; |
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| 70 | else if(y1==0||y2==0) result =0; |
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| 71 | else |
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| 72 | { |
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| 73 | G4double b = (std::log(y2)-std::log(y1))/(std::log(x2)-std::log(x1)); |
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| 74 | G4double a = std::log(y1) - b*std::log(x1);; |
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| 75 | result = (std::exp(a)/(b+1))*(std::pow(x2,b+1)-std::pow(x1,b+1)); |
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| 76 | } |
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| 77 | } |
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| 78 | else |
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| 79 | { |
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| 80 | throw G4HadronicException(__FILE__, __LINE__, "Unknown interpolation scheme in G4NeutronHPVector::Integrate"); |
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| 81 | } |
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| 82 | return result; |
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| 83 | } |
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| 84 | G4double G4NeutronHPInterpolator:: |
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| 85 | GetWeightedBinIntegral(const G4InterpolationScheme & aScheme, |
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| 86 | const G4double x1,const G4double x2,const G4double y1,const G4double y2) |
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| 87 | { // inline again later on @@@@ |
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| 88 | G4double result = 0; |
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| 89 | if(aScheme==HISTO||aScheme==CHISTO||aScheme==UHISTO) |
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| 90 | { |
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| 91 | result = 0.5*y1*(x2*x2-x1*x1); |
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| 92 | } |
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| 93 | else if(aScheme==LINLIN||aScheme==CLINLIN||aScheme==ULINLIN) |
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| 94 | { |
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| 95 | // G4double b = (y2-y1)/(x2-x1); |
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| 96 | // G4double a = y1 - b*x1; |
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| 97 | // result = 0.5*a*(x2*x2-x1*x1) + (b/3.)*(x2*x2*x2-x1*x1*x1); |
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| 98 | // Factor out x2-x1 to avoid divide by zero |
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| 99 | |
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| 100 | result = (y1*x2 - y2*x1)*(x2 + x1)/2. + (y2-y1)*(x2*x2 + x2*x1 + x1*x1)/3.; |
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| 101 | } |
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| 102 | else if(aScheme==LINLOG||aScheme==CLINLOG||aScheme==ULINLOG) |
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| 103 | { |
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| 104 | if(x1==0) result = y1; |
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| 105 | else if(x2==0) result = y2; |
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| 106 | else |
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| 107 | { |
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| 108 | G4double b = (y2-y1)/(std::log(x2)-std::log(x1)); |
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| 109 | G4double a = y1 - b*std::log(x1); |
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| 110 | result = ( x2*x2/2. * (a-b/2.+b*std::log(x2)) ) |
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| 111 | -( x1*x1/2. * (a-b/2.+b*std::log(x1)) ); |
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| 112 | } |
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| 113 | } |
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| 114 | else if(aScheme==LOGLIN||aScheme==CLOGLIN||aScheme==ULOGLIN) |
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| 115 | { |
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| 116 | if(y1==0||y2==0) result = 0; |
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| 117 | else |
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| 118 | { |
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| 119 | G4double b = (std::log(y2)-std::log(y1))/(x2-x1); |
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| 120 | G4double a = std::log(y1) - b*x1; |
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| 121 | result = std::exp(a)/(b*b)*( std::exp(b*x2)*(b*x2-1.) - std::exp(b*x1)*(b*x1-1.) ); |
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| 122 | } |
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| 123 | } |
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| 124 | else if(aScheme==LOGLOG||aScheme==CLOGLOG||aScheme==ULOGLOG) |
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| 125 | { |
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| 126 | if(x1==0) result = y1; |
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| 127 | else if(x2==0) result = y2; |
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| 128 | if(y1==0||y2==0) result = 0; |
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| 129 | else |
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| 130 | { |
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| 131 | G4double b = (std::log(y2)-std::log(y1))/(std::log(x2)-std::log(x1)); |
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| 132 | G4double a = std::log(y1) - b*std::log(x1);; |
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| 133 | result = std::exp(a)/(b+2.)*( std::pow(x2, b+2.) - std::pow(x1, b+2) ); |
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| 134 | } |
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| 135 | } |
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| 136 | else |
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| 137 | { |
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| 138 | throw G4HadronicException(__FILE__, __LINE__, "Unknown interpolation scheme in G4NeutronHPVector::Integrate"); |
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| 139 | } |
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| 140 | return result; |
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| 141 | } |
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